JPH10325161A - Freezing prevention method for elevated water tank and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a freezing prevention method and a freezing prevention device in which water can be surely prevented from freezing without considering a tank capacity, in an elevated water tank for storing water therein. SOLUTION: This elevated water tank 1 is fitted with a water temperature detector 7 and a liquid level detector 8, and they are connected with a controller 2. The elevated water tank 1 is constituted to that water in a water receiving tank 3 is led to the tank 1 by a water feed pump 4, and water in the elevated water tank 1 can be discharged to the water receiving tank 3 through a exhausting valve 5. When the water temperature in the elevated water tank 1 reaches the freezing prevention temperature, the controller 2 opens the exhausting valve 5 to discharge the water in the elevated water tank 1 to the water receiving tank 3, and when the liquid level in the elevated water tank 1 lowers up to a fixed position, it actuates the water feed pump 4. Hereby, one part of the water in the elevated water tank 1 is replaced with water of higher temperature in the water receiving tank 3 so as to prevent the water from freezing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing freezing of an elevated water tank used in various plants and buildings such as a water treatment plant.

[0002]

2. Description of the Related Art Elevated water tanks do not perform their intended function if the internal water storage freezes in winter, so that measures must be taken to prevent freezing. Conventionally, in order to prevent freezing of the elevated water tank, a heating device such as an electric heater has been provided in the elevated water tank to prevent freezing.

[0003]

As described above, the prior art has the following drawbacks because a heating device is provided in an elevated water tank to prevent freezing.

[0004] 1) When the capacity of the water tank is large, the capacity or quantity of the electric heater or the like must be increased.

[0005] 2) When the capacity of the water storage tank is small, it is necessary to provide a tank or an installation seat in consideration of the calorific value.

As described above, there is a problem that the method of preventing freezing differs depending on the capacity of the installed elevated water tank.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an antifreezing method and an antifreezing device which can reliably prevent freezing of water in an elevated water tank for storing water therein without considering the tank capacity. .

[0008]

According to the present invention, there is provided an automatic water supply / drainage system for storing water in an elevated water tank based on water temperature.
Alternatively, the automatic prevention of freezing of the water tank is standardized by performing automatic stirring in the tank.

That is, the present invention detects the water temperature inside the elevated water tank, and when the water temperature reaches a predetermined freezing prevention temperature,
A method for preventing freezing of an elevated water tank by discharging a part of the water in the elevated water tank and supplying high-temperature water to prevent freezing.

[0010] In order to solve the above-mentioned problems, the present invention provides:
Provided is a method for detecting a water temperature in an elevated water tank, and circulating or stirring the water in the elevated water tank to prevent freezing when the water temperature reaches a predetermined freezing prevention temperature.

According to the above-described freeze prevention method of the present invention,
If the temperature of the elevated water tank reaches the anti-freezing temperature by detecting the temperature of the water inside the elevated water tank, the water inside the elevated water tank is replaced with high-temperature water or causes a flow. Can be reliably prevented.

Further, the present invention provides a water temperature detector for detecting a water temperature in an elevated water tank, a discharge valve for discharging water in the elevated water tank, and a water supply for supplying water from a high-temperature water source to the elevated water tank. A pump and, when the temperature detected by the water temperature detector reaches a predetermined freezing prevention temperature, the discharge valve is opened, and the control means for driving the water supply pump to replace a certain amount of water in the elevated water tank. Provided is an antifreezing device for an elevated water tank.

According to this anti-freezing device, the anti-freezing method of the present invention in which the water in the elevated water tank is replaced with high-temperature water to prevent freezing can be effectively implemented.

Further, the present invention has been made in order to solve the above-mentioned problems.
A water temperature detector for detecting a water temperature inside the elevated water tank, a circulation pump for circulating water in the elevated water tank, and when the detected temperature of the water temperature detector reaches a predetermined freezing prevention temperature, the circulation pump is driven. And a control means for circulating the water in the elevated water tank.

According to this anti-freezing device, when the temperature in the elevated water tank reaches the anti-freezing temperature, the water in the water tank is caused to flow to prevent freezing, thereby effectively implementing the anti-freezing method of the present invention. It is possible.

In the present apparatus, if the circulating water from the circulating pump is returned from above the water surface in the elevated water tank to the elevated water tank, a smooth circulating flow is generated in the tank to freeze the water. It is preferable because it can be prevented uniformly.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on the illustrated embodiments.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIG. In FIG.
Reference numeral 1 denotes an elevated water tank, and the elevated water tank 1 is connected to a water receiving tank 3 via a water supply pump 4.

The elevated water tank 1 is connected to a water receiving tank 3 through a drain valve 5. Reference numeral 6 denotes an on-site water supply valve provided on a pipe for guiding the water stored in the elevated water tank 1 to a destination.

The elevated water tank 1 is provided with a water temperature detector 7 for detecting the temperature of the stored water and a liquid level detector 8 for detecting the level of the stored water.

Reference numeral 2 denotes a controller. The controller 2 receives signals from the water temperature detector 7 and the liquid level detector 8 and controls the start / stop of the water supply pump 4 and the opening / closing of the drain valve 5. I have.

The water supply system provided with the elevated water tank 1 shown in FIG. 1 has the above configuration, and when the water temperature detector 4 detects a predetermined freezing prevention temperature of the stored water in the elevated water tank 1, the drain valve 5 is opened. Then, the water stored in the elevated water tank 1 is discharged.

When the liquid level detector 8 detects that the liquid level in the elevated water tank 1 has dropped to a predetermined position, the controller 2 closes the drain valve 5 and activates the water supply pump 4 to receive the liquid into the elevated water tank 1. Start supplying hot water from the aquarium.

When the liquid level in the elevated water tank 1 rises to an arbitrary predetermined position, the liquid level detector 8 detects this and gives a signal to the controller 2, and the controller 2 stops the water supply pump 4.

As described above, freezing of the water stored in the elevated water tank 1 can be effectively prevented by replacing a part of the water in the elevated water tank 1 with high-temperature water.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, the same parts as those in the apparatus shown in FIG. 1 are denoted by the same reference numerals, and overlapping description thereof will be omitted.

In the apparatus shown in FIG. 2, the point that a water temperature detector 7 is provided in the elevated water tank 1 and is connected to the controller 2 is the same as that of FIG. 1, but a liquid level detector is not provided. Is different.

The controller 2 is similar to that of FIG. 1 in that the controller 2 is instructed to start and stop the water supply pump 4. However, the water supply pump 4 sucks the water stored in the elevated water tank 1 from below. 1 is different from the apparatus of FIG. 1 in that the apparatus is configured to be guided to the upper part of the elevated water tank 1.

The apparatus shown in FIG. 2 has the above configuration. When the water temperature detector 7 detects that the water stored in the elevated water tank 1 has reached the freezing prevention temperature, the controller 2 starts the water supply pump 4.

When the water supply pump 4 is started, the water in the elevated water tank 1 is sucked from the bottom and returned to the elevated water tank 1 from above the surface of the water in the elevated water tank 1. Thereby, the water in the elevated water tank 1 is circulated and stirred to prevent freezing.

[0031]

As described above, the present invention detects the water temperature inside the elevated water tank, and when the water temperature reaches the freezing prevention temperature, discharges a part of the water in the elevated water tank to supply high-temperature water. Or, the water in the elevated water tank is circulated or stirred to prevent freezing.

According to the freezing prevention method and the freezing prevention device of the present invention, freezing of the elevated water tank can be reliably prevented, and it is not necessary to change the structure according to the capacity of the elevated water tank. The structure and its operation system can be standardized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 elevated water tank 2 controller 3 water receiving tank 4 water supply pump 5 drain valve 6 on-site water supply valve 7 water temperature detector 8 liquid level detector

Claims (5)

[Claims] 1. A method for detecting the temperature of water in an elevated water tank, and when the temperature of the water reaches a predetermined freezing prevention temperature, drains a part of the water in the elevated water tank and supplies high-temperature water to freeze the water. A method for preventing freezing of an elevated water tank, characterized by preventing the freezing. 2. The elevated water tank detects a water temperature inside the elevated water tank, and when the water temperature reaches a predetermined freezing prevention temperature, circulates or agitates the water in the elevated water tank to prevent freezing. Freezing prevention method. 3. An elevated water tank for storing water therein, a water temperature detector for detecting the temperature of the water, a discharge valve for discharging water in the elevated water tank, and supplying water from a high-temperature water source to the elevated water tank. A water supply pump, and control means for opening the discharge valve when the temperature detected by the water temperature detector reaches a predetermined freezing prevention temperature, driving the water supply pump to replace a certain amount of water in the elevated water tank. An antifreezing device for an elevated water tank, comprising: 4. An elevated water tank for storing water therein, a water temperature detector for detecting the temperature of the water, a circulating pump for circulating water in the elevated water tank, and a temperature detected by the water temperature detector being a predetermined freezing prevention temperature. Control means for driving the circulation pump to circulate the water in the elevated water tank when the temperature of the elevated water tank is reached. 5. The apparatus for preventing freezing of an elevated water tank according to claim 4, wherein the circulating water from the circulation pump is returned into the elevated water tank from above the water surface in the elevated water tank.